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Quantum Physics

Title:
Generating remote entanglement via disentangling operations

Abstract: Shared entanglement between spatially separated systems is an essential
resource for quantum information processing including long-distance quantum
cryptography and teleportation. While purification protocols for mixed
distributed entangled quantum states exist, it is not clear how to optimally
distribute entanglement to remote locations. Here, we describe a deterministic
protocol for generating a maximally entangled state between remote locations
that only uses local operations on qubits, and requires no classical
communication between the separated parties. The procedure may provide
protection from decoherence before the entanglement is "activated," and could
be useful for quantum key distribution.